Many companies face difficult problems that require focused attention to solve, but many do not know where to begin. Sprint: How to Solve Big Problems and Test New Ideas in Just Five Days, a new book by Jake Knapp with John Zeratsky and Braden Kowitz, partners at Google Ventures, offers a plan for identifying the best solution to a problem, developing a prototype and testing it with customers. Knapp and Zeratsky recently spoke with the Knowledge at Wharton Show on Sirius XM channel 111 about how the process works. An edited transcript of the conversation follows. Knowledge at Wharton: How did this process come about? Jake Knapp: It all dates back 12 years to when my son was born, and I started to freak out about making good use of my work time so that I could spend more time with him and feel good about when I did go into the office.…